Get rid of all the library tags.

test/upgrade/report/shows_number_of_changed_dependencies_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library pub_tests;
-
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   integration("does not show how many newer versions are available for "
       "packages that are locked and not being upgraded", () {
     servePackages((builder) {
       builder.serve("a", "1.0.0");
       builder.serve("b", "1.0.0");
       builder.serve("c", "2.0.0");
@@ skipping 11 matching lines @@
       "b": "any",
       "c": "any"
     }).create();
 
     pubUpgrade(output: new RegExp(r"Changed 3 dependencies!$"));
 
     // Don't change anything.
     pubUpgrade(output: new RegExp(r"No dependencies changed.$"));
   });
 }